Merge tag 'usb-serial-4.20-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git...

Johan writes:

USB-serial updates for v4.20-rc1

Here are the USB-serial updates for 4.20-rc1, including:

 - support for CBUS GPIO on FTDI devices (FTX and FT232R)
 - fix of a long-standing transfer-length bug

Included are also various clean ups.

All have been in linux-next with no reported issues.

Signed-off-by: Johan Hovold <johan@kernel.org>
* tag 'usb-serial-4.20-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
  USB: serial: cypress_m8: remove set but not used variable 'iflag'
  USB: serial: cypress_m8: fix interrupt-out transfer length
  USB: serial: ftdi_sio: add support for FT232R CBUS gpios
  USB: serial: ftdi_sio: fix gpio name collisions
  USB: serial: ftdi_sio: implement GPIO support for FT-X devices
  USB: serial: cypress_m8: fix spelling mistake "retreiving" -> "retrieving"